What is the correct definition of 'heavy vehicle'?

What is the correct definition of 'heavy vehicle'?

1. Vehicles with a total maximum weight exceeding 2.5 tons
2. Vehicles with a total maximum weight exceeding 3.5 tons
3. Vehicles with a total maximum weight exceeding 5 tons

Correct answer

Vehicles with a total maximum weight exceeding 3.5 tons

This is the correct answer for the Cambodian driving theory test. Questions are drawn from the official Ministry of Public Works and Transport sign library and road rules.